JP6140128B2 - strainer - Google Patents

Description

  The present invention relates to a strainer provided with a scraper that is attached to a pipeline such as clean water and removes foreign matters adhering to a filtration member.

  Pipelines for flowing fluids such as clean water, agricultural water, and industrial water are usually varied depending on the type of piping and the shape of the inlet, such as dead leaves, dead branches, small fish, shellfish, algae, vinyl bags, earth and sand, rust, etc. Foreign matter is flowing with the fluid. These foreign substances cause clogging of the pipeline, reduction of the water supply capacity, failure of piping equipment, etc., and obstruct stable water supply.Therefore, foreign substances in the fluid are placed at the main points of the pipeline, such as a cylindrical mesh basket. A strainer that is removed by a filtering member is often installed.

  The strainer as described above removes foreign matter captured by the filtration member (attached to the filtration member) periodically or according to the clogging situation of the filtration member in order to prevent troubles caused by the clogging of the filtration member. There is a need to. However, when the filtration member is removed from the strainer for cleaning, there is a problem that the work is very troublesome and the fluid cannot flow to the downstream side of the strainer during the work.

  Therefore, in a strainer provided with a cylindrical filtration member in the casing, a scraper extending in the axial direction is attached to a rotating shaft arranged concentrically with the filtration member in a state of being close to or in sliding contact with the inner surface or outer surface of the filtration member, By rotating the rotating shaft, it is possible to scrape off the foreign matter adhering to the filtration member with a scraper without opening the filtration member, and open the valve attached to the foreign matter discharge port of the casing to discharge the scraped foreign matter to the outside. Many have been made (for example, see Patent Document 1).

  Further, in Patent Document 2, a scraper attached to the rotating shaft and facing the inner surface of a cylindrical filter member is formed in a hollow manner in the same manner as described above, and a suction port is provided on the surface of the scraper facing the filter member. A strainer has been proposed in which the hollow portion is communicated with the hollow portion of the backwash discharge pipe extending along the rotation axis. In this strainer, when one end of the backwashing discharge pipe is opened to the atmosphere, the fluid outside the filtering member backwashes the filtering member and flows into the suction port of the scraper, and foreign matter together with the backwashing fluid flows into the scraper and backwashing discharge pipe. It is discharged outside through the hollow part. Therefore, the foreign matter removal of the whole filtration member can be performed by rotating a rotating shaft simultaneously with opening of a backwash discharge pipe.

  On the other hand, in Patent Document 3, instead of the rotating shaft and the scraper described above, a disc-shaped scraper that is in sliding contact with the inner surface of the filtering member on the outer periphery of the operation shaft that is supported so as to be movable up and down inside the cylindrical filtering member. A strainer has been proposed in which a mechanism is fixed, and the operation shaft is moved up and down to scrape off foreign matter adhering to the filter member with a scraper.

Japanese Utility Model Publication No. 4-54803 Japanese Utility Model Publication No. 56-7297 Japanese Utility Model Publication No. 1-65610

  However, in the conventional strainer as described above, since the portion facing the inner surface or outer surface of the filter member of the scraper is formed of a brush or rubber, dead branches are stuck in the filter member or algae are stuck. In such a case, the scraper stops due to the resistance of these foreign matters during operation, and it may be difficult to remove the foreign matters, or the scraper may be damaged by an unreasonable operation. For this reason, in spite of having a scraper for removing foreign substances, it has been necessary to perform disassembly and cleaning relatively frequently depending on the situation.

  Then, this invention makes it a subject to reduce the frequency of the disassembly cleaning of the strainer provided with the scraper which removes a foreign material from a filtration member.

  In order to solve the above problems, the strainer of the present invention has a cylindrical filtration member disposed inside a casing through which a fluid passes, and is formed in an annular shape inside the filtration member. The metal scraper is arranged to move in the axial direction of the filtration member or rotate around the axis of the filtration member in a state of being close to the inner surface to remove foreign matters attached to the filtration member. .

  According to the above configuration, even when used in an environment in which a large amount of foreign matter that is difficult to remove from the filtration member flows with a conventional strainer, the annular metal scraper is operated and filtered at its outer periphery. Since the foreign matter captured by the member can be removed while being cut, the frequency of disassembly and cleaning can be reduced as compared with the conventional case.

  Here, it is desirable that the scraper is disposed to be inclined with respect to the axial direction of the filtration member. In this way, when the scraper cuts foreign matter by moving the filtration member in the axial direction or rotating around the axis of the filtration member, the cutting force causes the scraper concentric with the filtration member to move in the axial direction of the filtration member. It is smaller than the case of moving, and foreign matter can be removed more smoothly.

  As described above, the strainer of the present invention is provided with an annular metal scraper that removes foreign matter adhering to the filter member at the outer peripheral portion close to the inner surface of the filter member, inside the cylindrical filter member. Therefore, even if the foreign matter captured by the filtration member is difficult to remove with a conventional strainer, the foreign matter can be removed while being cut, and the frequency of disassembly and cleaning can be reduced as compared with the conventional case.

Front sectional view of the strainer of the embodiment 1 is an external perspective view of the main part of FIG. 1 is an enlarged cross-sectional view of the main part of FIG. Front sectional view for explaining the operation of the strainer of FIG. a and b are schematic diagrams for explaining a difference in foreign matter cutting force depending on a posture of a scraper. Front sectional view for explaining the operation of the strainer of FIG. Front sectional drawing explaining operation | movement at the time of backwashing of the strainer of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, the strainer includes a casing 1 interposed in the middle of a pipeline (not shown) for flowing fluid such as clean water and agricultural water, and a cylinder vertically disposed in the casing 1. And a hollow shaft 3 that is passed through the center of the mesh cage 2 with the upper end protruding from the casing 1 and opened only at the upper end, and an outer periphery on the lower end side of the hollow shaft 3. Are provided with two annular scrapers 5 and 6 attached up and down with a plurality of spokes 4 and an upper discharge valve 7 connected to the upper end of the hollow shaft 3. Most of these parts are formed of a metal such as stainless steel having corrosion resistance, and the scrapers 5 and 6 are entirely made of metal. Although not shown, a drive device that moves (lifts) the hollow shaft 3 in the axial direction of the net cage 2 or rotates it around the axis of the net cage 2 is provided at the upper end of the hollow shaft 3. It is attached.

  The casing 1 has an inflow port 1a on one end side (left side in FIG. 1) and an outflow port 1b on the other end side (right side in FIG. 1). The central portion in the flow direction has a lid portion 1c that supports the hollow shaft 3 so that the hollow shaft 3 can be moved up and down, and a lower portion is a funnel-shaped foreign matter discharge port 1d, and a lower discharge valve 8 is connected to the foreign matter discharge port 1d. Has been. An annular partition piece 1e is formed on the inner surface of the central portion so as to be in close contact with the outer periphery of the opening on the upper end side of the net cage 2, so that the space in the casing 1 is upstream and downstream. It is divided into.

  The upper end edge of the mesh basket 2 is formed obliquely with respect to the axial direction, and is disposed in the central portion of the casing 1 in such a posture that one end side of the casing 1 is lowered, and from the inlet 1a of the casing 1 to the outlet 1b. The fluid can flow smoothly. The lower end edge of the mesh cage 2 is fixed to the inner surface of the casing 1 via an annular mesh cage attachment member 9. In addition, the net cage 2 can be placed horizontally, and in that case, the lifting and lowering of the hollow shaft 3 by the drive of the driving device is changed to the horizontal movement.

  Of the two annular scrapers 5, 6, the lower scraper 6 is arranged concentrically with the mesh cage 2 (and the hollow shaft 3), but the upper scraper 5 is parallel to the upper edge of the mesh cage 2. (In a posture inclined with respect to the axial direction of the net cage 2), and when it is raised as will be described later, the higher side of the upper portion of the net cage 2 can be reliably removed. The scrapers 5 and 6 are bonded to each other on the lower side of the upper scraper 5 and are connected to each other by a connecting member 10 extending in the axial direction of the mesh basket 2 on the higher side of the upper scraper 5. Each scraper 5, 6 is formed so that its outer peripheral portion is close to the inner surface of the net cage 2, and outer peripheral grooves 5 a, 6 a facing the inner surface of the net cage 2 are provided on the outer peripheral portion thereof.

  The inner spaces of the outer peripheral grooves 5a and 6a of the scrapers 5 and 6 are communicated with the hollow portion of the hollow shaft 3 through a discharge passage 11 that passes through the spoke 4 that connects the scrapers 5 and 6 and the hollow shaft 3. ing. That is, the discharge channel 11 has an inlet portion from the bottom to the inner peripheral surface of the outer peripheral grooves 5a, 6a of each scraper 5, 6 and an outlet portion from the outer peripheral surface to the inner peripheral surface of the hollow shaft 3, A central portion between the inlet portion and the outlet portion is formed by the spoke 4.

  This strainer has the above-described configuration, and during normal operation, as shown in FIG. 1, the fluid that has flowed from the upstream side of the pipeline to the inlet 1 a of the casing 1 flows into the mesh cage at the center of the casing 1. 2 so that foreign matter is removed when passing through the mesh cage 2 from the inside to the outside, and flows from the outside of the mesh cage 2 through the outlet 1b of the casing 1 to the downstream side of the pipeline. It has become.

  When the foreign matter adhering to the mesh basket 2 is to be removed periodically or according to the clogging situation of the mesh cage 2, as shown in FIG. 4, the driving device is driven to move the hollow shaft 3 up and down. Rotate while rotating. Thereby, each scraper 5 and 6 rotates while raising / lowering integrally with the hollow shaft 3, and scrapes off the foreign matter captured by the net cage 2 at the outer peripheral portion thereof. At this time, relatively large foreign matters such as dead branches and algae are cut into the scrapers 5 and 6 and removed from the net cage 2.

  FIG. 5 shows the foreign matter cutting action of the upper scraper 5 only by rotation (when raising and lowering is not considered) in which the shape of the hole 2a of the mesh cage 2 and the cross-sectional shape of the foreign matter A clogged in the hole 2a are represented as circles. It is a schematic diagram. As shown in FIG. 5 (a), the upper scraper 5 is arranged in a posture inclined with respect to the axial direction of the net cage 2, so that the foreign matter A that is contacted by the rotation is directed from the contact toward the center. Attempts to cut in a direction that is tilted. On the other hand, if the scraper 5 ′ extending in the axial direction of the net cage 2 is rotated around the axis of the net cage 2 as shown in FIG. Since A is to be cut in the direction from the contact toward the center, the cutting force at that time is larger than in the case of FIG. That is, the upper scraper 5 of the embodiment has a cutting force when rotating around the axis of the net cage 2 as compared to the scraper 5 ′ extending in the axial direction of the net cage 2 as in the prior art.

  Actually, the scrapers 5 and 6 rotate while moving up and down as described above. Therefore, when the upper and lower scrapers 5 come into contact with the foreign object A by decreasing the lifting speed and increasing the rotating speed, they are centered from the contact points. By increasing the angle formed by the direction toward the upper side and the traveling direction (cutting direction) of the upper scraper 5, the cutting force can be made smaller than before and foreign matters can be removed smoothly.

  On the other hand, since the lower scraper 6 is arranged concentrically with the net cage 2, by rotating while moving up and down, regardless of the magnitude relationship between the lifting speed and the rotating speed, the lower scraper 6 comes into contact with the foreign object A from the contact point. The direction toward the center (vertical direction) and the cutting direction are different, and the cutting force is smaller than in the conventional case, so that foreign matters can be removed smoothly.

  Since the foreign matter scraped off from the mesh basket 2 by the outer peripheral portions of the scrapers 5 and 6 in this way is accumulated in the foreign matter discharge port 1d at the lower portion of the casing 1, as shown in FIG. After stopping, the lower discharge valve 8 is opened, and the foreign matter accumulated in the foreign matter discharge port 1d is discharged to the outside by the fluid pressure.

  Further, in this strainer, in order to remove foreign matter remaining (clogged) in the net cage 2 after the operation of scraping off foreign matter from the net cage 2 as described above, as shown in FIG. 7 is opened and the basket 2 is backwashed. When the backwashing is performed, by opening the upper discharge valve 7, the fluid in the hollow portion of the hollow shaft 3 is discharged to the outside, and the fluid outside the mesh cage 2 backwashes the mesh cage 2. Then, it flows into the outer peripheral grooves 5 a and 6 a of the scrapers 5 and 6, and the foreign matters together with the backwash fluid are discharged to the outside through the discharge passage 11 and the hollow portion of the hollow shaft 3. At the same time, by driving the drive device and rotating the hollow shaft 3 and the scrapers 5 and 6 integrally, the portions facing the scraper outer peripheral grooves 5a and 6a of the mesh cage 2, that is, the scrapers 5 and 6 are rotated. The part to be backwashed is moved upward, and the entire mesh basket 2 is backwashed.

  Even when backwashing is performed as described above, a part of the foreign matter remaining in the mesh basket 2 is scraped off by the scrapers 5 and 6 and collected in the foreign matter discharge port 1d. Similarly, the lower discharge valve 8 is opened and the accumulated foreign matter is discharged to the outside.

  As described above, the strainer rotates the annular metal scrapers 5 and 6 provided inside the vertically placed cylindrical mesh cage 2 while moving up and down, so that the mesh cage 2 is formed at the outer periphery thereof. Since the attached foreign matter is removed, even if the foreign matter caught in the net cage 2 is difficult to remove with a conventional strainer, such as dead branches and algae, the foreign matter can be removed while reliably cutting it. It has become. Therefore, it is not necessary to perform disassembly and cleaning frequently regardless of the environment of use, especially when used in an environment where many dead branches and algae flow, etc. Can do.

  Here, in the above-described embodiment, the two scrapers 5 and 6 are rotated while being integrally moved up and down, but the scraper is inclined with respect to the axial direction of the cylindrical filter member (the upper scraper of the embodiment). 5) and one that is concentric with the filtering member (lower scraper 6 of the embodiment) may be used. Among them, an inclined scraper can be operated only in lifting / lowering, rotating only, or rotating while lifting / lowering, and when rotating while lifting / lowering, the cutting force of foreign matter is reduced as described above. It is desirable to adjust the lifting speed and the rotation speed. On the other hand, when a scraper concentric with the filtration member is used, an elevating operation is required to scrape off the foreign matter from the filtering member. This is preferable because the cutting force can be reduced.

  Further, the net cage 2 of the embodiment can be backwashed. However, if the backwashing is not performed, the hollow shaft 3 can be replaced with a solid shaft, and the upper discharge valve 7 and the discharge flow path can be replaced. Since 11 can be omitted, the structure can be simplified.

  Further, in the embodiment, the annular scrapers 5 and 6 attached to the hollow shaft 3 with the spokes 4 are used. However, as the scraper, a disc-like one that is directly attached to the shaft member concentric with the cylindrical filter member is used. It can also be used. In that case, the disk-shaped scraper may be provided with an opening through which the foreign matter scraped (cut) from the filter member on the upper side passes through to the lower side (foreign matter discharge port side). Further, by forming a discharge channel inside the scraper and making the shaft member the same hollow shaft as in the embodiment, the filtration member can be backwashed.

1 Casing 1a Inlet 1b Outlet 2 Net cage (filter member)
3 hollow shaft 4 spokes 5 and 6 scrapers 5a and 6a outer peripheral groove 7 upper discharge valve 8 lower discharge valve 11 discharge flow path

Claims (1)

A cylindrical filtration member is arranged inside a casing through which fluid passes, and is formed in an annular shape inside the filtration member, and moves in the axial direction of the filtration member in a state where the outer peripheral portion is close to the inner surface of the filtration member. Or a strainer provided with a metal scraper that rotates around the axis of the filtration member to remove foreign matter adhering to the filtration member,
A strainer, wherein the scraper is disposed to be inclined with respect to the axial direction of the filtration member.

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